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Error

Call to a member function entriesByEvents() on null

$_GET = [
    'siteid' => 8,
    'id' => '531',
];

$_SESSION = [
    '__flash' => [],
    'siteid' => 8,
    'site' => unserialize('O:15:"app\\models\\Site":10:{s:27:"' . "\0" . 'yii\\base\\Component' . "\0" . '_events";a:0:{}s:35:"' . "\0" . 'yii\\base\\Component' . "\0" . '_eventWildcards";a:0:{}s:30:"' . "\0" . 'yii\\base\\Component' . "\0" . '_behaviors";a:0:{}s:23:"' . "\0" . 'yii\\base\\Model' . "\0" . '_errors";N;s:27:"' . "\0" . 'yii\\base\\Model' . "\0" . '_validators";N;s:25:"' . "\0" . 'yii\\base\\Model' . "\0" . '_scenario";s:7:"default";s:36:"' . "\0" . 'yii\\db\\BaseActiveRecord' . "\0" . '_attributes";a:5:{s:2:"id";i:8;s:3:"uri";s:4:"PF04";s:5:"title";s:24:"宮城県テニス協会";s:5:"email";s:17:"mtajimu@nifty.com";s:11:"short_title";s:6:"宮城";}s:39:"' . "\0" . 'yii\\db\\BaseActiveRecord' . "\0" . '_oldAttributes";a:5:{s:2:"id";i:8;s:3:"uri";s:4:"PF04";s:5:"title";s:24:"宮城県テニス協会";s:5:"email";s:17:"mtajimu@nifty.com";s:11:"short_title";s:6:"宮城";}s:33:"' . "\0" . 'yii\\db\\BaseActiveRecord' . "\0" . '_related";a:0:{}s:47:"' . "\0" . 'yii\\db\\BaseActiveRecord' . "\0" . '_relationsDependencies";a:0:{}}'),
    'need_association' => true,
];